budget dana 60

I know carriers are 2 series. The 3 series and 4 series. 4.56 and steeper use the 4 series. You can put 4.56 and steeper on a 3 series but you need a spacer. I dont think you can put the lower gearsets (numerical) on a 4 series carrier. This might apply to spools also. We went from 4.11s to 3.63s in a 57 olds housing last year. With a spool. We also had to get a kit. Kit had a spacer and instructions to machine the spool to fit the spacer and move the spool over. So now we can move the spool to fit the gearset we want to use.That spool was not easy to machine as its a tough metal. I'am hoping your not in a similar situation.